US4499244A - Process for curing a chlorinated polyolefin in the presence of aliphatic polyhydroxy alcohol - Google Patents

Process for curing a chlorinated polyolefin in the presence of aliphatic polyhydroxy alcohol Download PDF

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US4499244A
US4499244A US06/527,562 US52756283A US4499244A US 4499244 A US4499244 A US 4499244A US 52756283 A US52756283 A US 52756283A US 4499244 A US4499244 A US 4499244A
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elastomer
parts
polyhydroxy alcohol
polyethylene
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Wolfgang Honsberg
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EIDP Inc
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EI Du Pont de Nemours and Co
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/05—Alcohols; Metal alcoholates
    • C08K5/053—Polyhydroxylic alcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals

Definitions

  • chlorosulfonated polyolefins are cured with sulfur or compounds that release sulfur when heated.
  • sulfur accelerators such as thiuram di- or tetrasulfides, that function as free radical traps are required during curing to prevent decomposition of sulfonyl chloride groups, thus indicating free radicals are detrimental to obtaining an adequately cured product [see King U.S. Pat. No. 2,994,688 and Nersasian, King and Johnson, J. Applied Polymer Science 8, Pages 337-354 (1964)].
  • Sulfur cures, or more precisely vulcanization, of chlorosulfonated polyolefins often results in adhesion of the rubber to the mold due to sulfur build-up on the mold cavity wall. Also, the sulfurous build-up in the mold cavity can adhere to the rubber article in the mold during vulcanization resulting in formation of discolored areas on the polymer surface.
  • Use of an alternate cure system based on peroxides eliminates these disadvantages and peroxide cures of chlorinated polyethylene or chlorosulfonated polyolefins have been successful commercially. However, they require relatively large amounts of inorganic acid acceptor, for example, magnesium oxide, if satisfactory physical properties are to be obtained.
  • the high levels of acid acceptors required to promote peroxide cures can detrimentally affect certain properties of the elastomer, for example, compound viscosity and water-resistance.
  • the compression set of peroxide-cured chlorinated polyethylene or chlorosulfonated polyethylene is poor when lower levels of acid acceptor are used thus indicating that a high state of cure has not been attained. It is desirable to obtain a high state of cure of chlorinated polyethylene elastomers or chlorosulfonated polyethylene elastomers using lower levels of acid acceptor.
  • the present invention provides a novel peroxide-curable chlorosulfonated polyethylene elastomer composition or chlorinated polyethylene elastomer composition that reaches a high state of cure by a process in which the chlorinated polyolefin compositions are cured in the presence of certain polyhydroxy alcohols.
  • the present invention provides a chlorinated polyolefin elastomer composition having a high state of cure, as indicated by its compression set value. More specifically this invention is directed to a curable chlorinated polyolefin elastomer composition selected from the group consisting of chlorinated polyethylene having 20-50% by weight chlorine and chlorosulfonated polyethylene having 20-50% by weight chlorine and 0.2-1.5% by weight sulfur, a basic metal oxide or hydroxide acid acceptor, an organic peroxide curing agent, and about 0.2-10 parts, preferably 1-3 parts, per 100 parts elastomer of at least one aliphatic polyhydroxy alcohol having at least two hydroxyl groups and in which the hydroxyl groups are on carbon atoms in the 1,2 or 1,3 positions relative to each other and said polyhydroxy alcohol has a molecular weight of less than about 300.
  • the polyhydroxy aliphatic alcohol contains 2-6 carbon atoms and the chlorinated polyolefin is chlorosulfonated polyethylene.
  • these elastomers can be used for making hose and belting but are especially useful for jacketing small diameter wire, e.g. automotive ignition wire.
  • the chlorinated polyolefin elastomers are cured by compounding a mixture of the elastomer, a basic metal oxide or hydroxide acid acceptor, an organic peroxide curing agent and about 0.2-10 parts per 100 parts elastomer of at least one aliphatic polyhydroxy alcohol with the proviso that when the elastomer is chlorinated polyethylene about 0.01-0.1 moles of acid acceptor per 100 parts chlorinated polyethylene is added to the mixture and when the elastomer is chlorosulfonated polyethylene about 0.025-0.25 moles of acid acceptor per 100 parts chlorosulfonated polyethylene is added to the mixture, and said polyhydroxy alcohol has at least two hydroxyl groups in which the hydroxyl groups are in the 1,2 or 1,3 positions relative to each other and said polyhydroxy alcohol has a molecular weight of less than about 300 and heating the mixture to a temperature above the decomposition temperature of the peroxide and below the decomposition temperature of the elastomer until the
  • the chlorosulfonated polyethylene that is peroxide cured can be any of those well-known elastomers prepared by the reaction of a chlorosulfonating agent, such as a mixture of chlorine and sulfur dioxide gases or sulfuryl chloride, with a saturated hydrocarbon polymer, such as polyethylene, or a copolymer of ethylene with a C 3 -C 8 alpha-olefin.
  • a chlorosulfonating agent such as a mixture of chlorine and sulfur dioxide gases or sulfuryl chloride
  • a saturated hydrocarbon polymer such as polyethylene
  • copolymer of ethylene with a C 3 -C 8 alpha-olefin such as polyethylene
  • the polyethylene can be either the low density, high pressure type or the high density homo- or copolymer type prepared with a coordination catalyst at lower pressure.
  • polyethylene as used herein includes ethylene copolymers that contain up to about 10% by weight of C 3 -C 8 comonomers that are used to make chlorinated polyethylene or chlorosulfonated polyethylene.
  • the number average molecular weight of the chlorosulfonated polyethylene is usually at least 10,000.
  • the chlorosulfonation reaction is controlled to produce a polymer product which contains 20-50 percent by weight chlorine and 0.2-1.5 percent by weight sulfur, the latter being in the form of sulfonyl chloride groups attached to the saturated hydrocarbon chain.
  • Representative polymers of this type are well known and described in, for example, U.S. Pat. Nos. 2,213,786, 2,982,759 and 3,299,014.
  • the chlorinated polyethylenes used in this invention have 20-50 percent by weight chlorine, and, therefore, the polymers are elastomeric.
  • the chlorinated polyethylenes used in this invention are well-known commercial products made by reacting chlorine gas with polyethylene having a number average molecular weight greater than 10,000.
  • the polyhydroxy alcohols used as curing aids in the composition of the present invention are added to the elastomer compositions in amounts of about 0.2-10 parts per 100 parts chlorinated polyethylene or chlorosulfonated polyethylene elastomer, and preferably 1-3 parts per 100 parts chlorinated polyethylene or chlorosulfonated polyethylene elastomer. If less than about 0.2 parts per 100 parts elastomer of polyhydroxy alcohol is used, no significant effect is seen in the state of cure of the elastomer and large amounts of acid acceptors must be used in such situations to provide a satisfactory degree of cure, and, if more than about 10 parts polyhydroxy alcohol is used per 100 parts elastomer, no further significant beneficial effects result.
  • the polyhydroxy alcohols are aliphatic alcohols and contain hydroxyl groups on carbon atoms in the 1,2 or 1,3 positions relative to each other and have molecular weights less than about 300.
  • the polyhydroxy alcohols used in the invention can be substituted with various groups such as alkoxy or carboalkoxy radicals, usually having 1-18 carbons atoms in the alkoxy radical.
  • the molecular weight requirements pertain to the polyhydroxy alcohol only and not its equivalent ester- or ether-forming derivatives. Substitution of such radicals on the polyhydroxy alcohol does not interfere with peroxide curing.
  • the aliphatic polyhydroxy alcohols contain 2 to 6 carbon atoms.
  • Polyhydroxy alcohols that can be used include 2,2-dimethyl-1,3-propanediol, ethylene glycol, glycerol, 1,2-propanediol, dipentaerythritol, and pentaerythritrol available as PE-200, a technical grade sold by Hercules, Inc., pentaerythritol mono- and distearate, mono- and dilaurate, mono- and dioleate and mono- and dipalmitate.
  • Organic peroxides used to cure elastomers can be used in this invention to cure the chlorinated polyethylene or chlorosulfonated polyethylene elastomers.
  • Such peroxide curing agents are well known in the art and include: 2,5-dimethyl-2,5-di-(t-butylperoxy)hexyne-3; 2,5-dimethyl-2,5-di-(t-butylperoxy)hexane; di-t-butylperoxide; 2,5-di-(t-amylperoxy)-2,5-dimethyl hexane; 2,5-di(t-butylperoxy)-2,5-diphenyl hexane; 2,5-di(t-butylperoxy)-2,2,5-dicyclohexyl hexane; bis(alpha-methylbenzyl)peroxide, also called dicumyl peroxide; and dimethyl-benzyl-t-butyl per
  • Dicumyl peroxide is preferred because of its ready availability and cost.
  • the amount of peroxide curing agent added to the chlorinated polyolefin elastomer is about 2 to 8 parts peroxide per 100 parts elastomer and, preferably 3 to 4 parts per 100 parts elastomer. The process is conducted without employing an organic sulfur-containing curing agent.
  • a conventional basic metal oxide or hydroxide acid acceptor is added to the chlorinated polyethylene or chlorosulfonated polyethylenee compositions that are to be cured.
  • the acid acceptor has a stabilizing effect on the composition because hydrochloric acid (and sulfur acids in the case of chlorosulfonated polyethylene) that is generated during curing is substantially neutralized by the inorganic metal oxides or hydroxides.
  • the metal oxides and hydroxides that are generally used are those of magnesium, calcium or lead. Magnesium oxide, calcium oxide, lead oxide and calcium hydroxide are preferred, especially magnesium oxide.
  • the amount of acid acceptor varies depending on the particular polyhydroxy alcohol that is used in the composition and the chlorinated polyolefin to be cured.
  • the amount of acid acceptor used is about 0.01-0.1 moles per 100 parts of chlorinated polyethylene, preferably about 0.025- 0.075 moles per 100 parts chlorinated polyethylene.
  • the higher the amount of polyhydroxy alcohol added to the composition the lower the amount of acid acceptor which can be used. Low levels of acid acceptor result in better processing of the elastomer due to lower compound viscosity.
  • a conventional coagent can be present in the elastomer composition, generally in amounts up to 6 parts per 100 parts chlorinated polyolefine, usually about 1 to 4 parts per 100 parts chlorinated polyolefin elastomer is adequate.
  • These coagents are polyunsaturated compounds that cooperate with the peroxide curing agent to more efficiently use the peroxide.
  • the coagents are organic compounds containing at least one, preferably two or more, aliphatic unsaturated groups, preferably allyl. Representative coagents that can be used include triallyl cyanurate, diallyl maleate and diallyl terephthalate.
  • the chlorinated polyethylene or chlorosulfonated polyethylene composition can, and usually does, contain conventional fillers, such as carbon black, calcium carbonate, clay, silica, hydrated alumina and the like; pigments such as titanium dioxide; and stabilizers such as dialkylthiodipropionate and thiodiethylene bis[3,5-di-t-butyl-4-hydroxyhydrocinnamate], in varying amounts.
  • conventional fillers such as carbon black, calcium carbonate, clay, silica, hydrated alumina and the like
  • pigments such as titanium dioxide
  • stabilizers such as dialkylthiodipropionate and thiodiethylene bis[3,5-di-t-butyl-4-hydroxyhydrocinnamate], in varying amounts.
  • One hundred parts of curable chlorosulfonated polyethylene containing, by weight, 35% Cl, 1% S is compounded on a two-roll mill with the following ingredients charged to the mill: 40 parts SRF Black, 3.2 parts dicumyl peroxide, 4 parts triallylcyanurate and metal oxide or hydroxide acid acceptor and polyhydroxy alcohol as indicated in the table below.
  • the temperature of the mix during compounding is held below about 60° C. and the ingredients are uniformly mixed in about 4 minutes.
  • the compounded stock is removed from the mill, cured for 30 minutes at 160° C., and tested as indicated.
  • the test data show that the peroxide-cured chlorosulfonated polyethylenes that are cured in the presence of an aliphatic polyhydroxy alcohol have excellent compression set and other satisfactory physical properties thus indicating a tight cure.
  • One hundred parts of a curable chlorinated polyethylene elastomer containing 35% Cl by weight is compounded on a two-roll mill with the following ingredients charged to the mill: 40 parts SRF Black, 2.4 parts dicumyl peroxide, 1 part triallylcyanurate and a metal oxide or hydroxide acid acceptor and a polyhydroxy alcohol as indicated in the table below.
  • the temperature of the mix during compounding is held below about 60° C. and the ingredients are uniformly mixed in about 4 minutes.
  • the compounded stock is removed from the mill, cured for 30 minutes at 160° C. and tested as indicated.
  • the test data show that the peroxide cured chlorinated polyethylenes that are cured in the presence of an aliphatic polyhydroxy alcohol have excellent compression set and other satisfactory physical properties thus indicating that a high degree of cure was attained.

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Abstract

A curable chlorinated polyolefin elastomer composition comprising a basic metal oxide or hydroxide, such as magnesium oxide, an organic peroxide and about 0.2-10 parts per 100 parts elastomer of at least one aliphatic polyhydroxy alcohol having at least two hydroxyl groups in which the hydroxyl groups are on carbon atoms in the 1,2 or 1,3 positions relative to each other and said polyhydroxy alcohol has a molecular weight less than about 300.

Description

CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation-in-part of application Ser. No. 353,361 filed Mar. 1, 1982, now abandoned.
BACKGROUND OF THE INVENTION
In industry chlorosulfonated polyolefins are cured with sulfur or compounds that release sulfur when heated. Such processes teach that sulfur accelerators, such as thiuram di- or tetrasulfides, that function as free radical traps are required during curing to prevent decomposition of sulfonyl chloride groups, thus indicating free radicals are detrimental to obtaining an adequately cured product [see King U.S. Pat. No. 2,994,688 and Nersasian, King and Johnson, J. Applied Polymer Science 8, Pages 337-354 (1964)]. Sulfur cures, or more precisely vulcanization, of chlorosulfonated polyolefins often results in adhesion of the rubber to the mold due to sulfur build-up on the mold cavity wall. Also, the sulfurous build-up in the mold cavity can adhere to the rubber article in the mold during vulcanization resulting in formation of discolored areas on the polymer surface. Use of an alternate cure system based on peroxides eliminates these disadvantages and peroxide cures of chlorinated polyethylene or chlorosulfonated polyolefins have been successful commercially. However, they require relatively large amounts of inorganic acid acceptor, for example, magnesium oxide, if satisfactory physical properties are to be obtained. Unfortunately, the high levels of acid acceptors required to promote peroxide cures can detrimentally affect certain properties of the elastomer, for example, compound viscosity and water-resistance. However, the compression set of peroxide-cured chlorinated polyethylene or chlorosulfonated polyethylene is poor when lower levels of acid acceptor are used thus indicating that a high state of cure has not been attained. It is desirable to obtain a high state of cure of chlorinated polyethylene elastomers or chlorosulfonated polyethylene elastomers using lower levels of acid acceptor.
The present invention provides a novel peroxide-curable chlorosulfonated polyethylene elastomer composition or chlorinated polyethylene elastomer composition that reaches a high state of cure by a process in which the chlorinated polyolefin compositions are cured in the presence of certain polyhydroxy alcohols.
SUMMARY OF THE INVENTION
The present invention provides a chlorinated polyolefin elastomer composition having a high state of cure, as indicated by its compression set value. More specifically this invention is directed to a curable chlorinated polyolefin elastomer composition selected from the group consisting of chlorinated polyethylene having 20-50% by weight chlorine and chlorosulfonated polyethylene having 20-50% by weight chlorine and 0.2-1.5% by weight sulfur, a basic metal oxide or hydroxide acid acceptor, an organic peroxide curing agent, and about 0.2-10 parts, preferably 1-3 parts, per 100 parts elastomer of at least one aliphatic polyhydroxy alcohol having at least two hydroxyl groups and in which the hydroxyl groups are on carbon atoms in the 1,2 or 1,3 positions relative to each other and said polyhydroxy alcohol has a molecular weight of less than about 300. Preferably, the polyhydroxy aliphatic alcohol contains 2-6 carbon atoms and the chlorinated polyolefin is chlorosulfonated polyethylene. These elastomers can be used for making hose and belting but are especially useful for jacketing small diameter wire, e.g. automotive ignition wire. The chlorinated polyolefin elastomers are cured by compounding a mixture of the elastomer, a basic metal oxide or hydroxide acid acceptor, an organic peroxide curing agent and about 0.2-10 parts per 100 parts elastomer of at least one aliphatic polyhydroxy alcohol with the proviso that when the elastomer is chlorinated polyethylene about 0.01-0.1 moles of acid acceptor per 100 parts chlorinated polyethylene is added to the mixture and when the elastomer is chlorosulfonated polyethylene about 0.025-0.25 moles of acid acceptor per 100 parts chlorosulfonated polyethylene is added to the mixture, and said polyhydroxy alcohol has at least two hydroxyl groups in which the hydroxyl groups are in the 1,2 or 1,3 positions relative to each other and said polyhydroxy alcohol has a molecular weight of less than about 300 and heating the mixture to a temperature above the decomposition temperature of the peroxide and below the decomposition temperature of the elastomer until the elastomer is cured.
DESCRIPTION OF PREFERRED EMBODIMENTS
The chlorosulfonated polyethylene that is peroxide cured can be any of those well-known elastomers prepared by the reaction of a chlorosulfonating agent, such as a mixture of chlorine and sulfur dioxide gases or sulfuryl chloride, with a saturated hydrocarbon polymer, such as polyethylene, or a copolymer of ethylene with a C3 -C8 alpha-olefin. The polyethylene can be either the low density, high pressure type or the high density homo- or copolymer type prepared with a coordination catalyst at lower pressure. The term polyethylene as used herein includes ethylene copolymers that contain up to about 10% by weight of C3 -C8 comonomers that are used to make chlorinated polyethylene or chlorosulfonated polyethylene. The number average molecular weight of the chlorosulfonated polyethylene is usually at least 10,000. The chlorosulfonation reaction is controlled to produce a polymer product which contains 20-50 percent by weight chlorine and 0.2-1.5 percent by weight sulfur, the latter being in the form of sulfonyl chloride groups attached to the saturated hydrocarbon chain. Representative polymers of this type are well known and described in, for example, U.S. Pat. Nos. 2,213,786, 2,982,759 and 3,299,014.
The chlorinated polyethylenes used in this invention have 20-50 percent by weight chlorine, and, therefore, the polymers are elastomeric. The chlorinated polyethylenes used in this invention are well-known commercial products made by reacting chlorine gas with polyethylene having a number average molecular weight greater than 10,000.
The polyhydroxy alcohols used as curing aids in the composition of the present invention are added to the elastomer compositions in amounts of about 0.2-10 parts per 100 parts chlorinated polyethylene or chlorosulfonated polyethylene elastomer, and preferably 1-3 parts per 100 parts chlorinated polyethylene or chlorosulfonated polyethylene elastomer. If less than about 0.2 parts per 100 parts elastomer of polyhydroxy alcohol is used, no significant effect is seen in the state of cure of the elastomer and large amounts of acid acceptors must be used in such situations to provide a satisfactory degree of cure, and, if more than about 10 parts polyhydroxy alcohol is used per 100 parts elastomer, no further significant beneficial effects result. The polyhydroxy alcohols are aliphatic alcohols and contain hydroxyl groups on carbon atoms in the 1,2 or 1,3 positions relative to each other and have molecular weights less than about 300. The polyhydroxy alcohols used in the invention can be substituted with various groups such as alkoxy or carboalkoxy radicals, usually having 1-18 carbons atoms in the alkoxy radical. The molecular weight requirements pertain to the polyhydroxy alcohol only and not its equivalent ester- or ether-forming derivatives. Substitution of such radicals on the polyhydroxy alcohol does not interfere with peroxide curing. Preferably the aliphatic polyhydroxy alcohols contain 2 to 6 carbon atoms. Polyhydroxy alcohols that can be used include 2,2-dimethyl-1,3-propanediol, ethylene glycol, glycerol, 1,2-propanediol, dipentaerythritol, and pentaerythritrol available as PE-200, a technical grade sold by Hercules, Inc., pentaerythritol mono- and distearate, mono- and dilaurate, mono- and dioleate and mono- and dipalmitate.
Organic peroxides used to cure elastomers can be used in this invention to cure the chlorinated polyethylene or chlorosulfonated polyethylene elastomers. Such peroxide curing agents are well known in the art and include: 2,5-dimethyl-2,5-di-(t-butylperoxy)hexyne-3; 2,5-dimethyl-2,5-di-(t-butylperoxy)hexane; di-t-butylperoxide; 2,5-di-(t-amylperoxy)-2,5-dimethyl hexane; 2,5-di(t-butylperoxy)-2,5-diphenyl hexane; 2,5-di(t-butylperoxy)-2,2,5-dicyclohexyl hexane; bis(alpha-methylbenzyl)peroxide, also called dicumyl peroxide; and dimethyl-benzyl-t-butyl peroxide; and bis-(t-butylperoxy)-diisopropylbenzene. Dicumyl peroxide is preferred because of its ready availability and cost. Generally, the amount of peroxide curing agent added to the chlorinated polyolefin elastomer is about 2 to 8 parts peroxide per 100 parts elastomer and, preferably 3 to 4 parts per 100 parts elastomer. The process is conducted without employing an organic sulfur-containing curing agent.
A conventional basic metal oxide or hydroxide acid acceptor is added to the chlorinated polyethylene or chlorosulfonated polyethylenee compositions that are to be cured. The acid acceptor has a stabilizing effect on the composition because hydrochloric acid (and sulfur acids in the case of chlorosulfonated polyethylene) that is generated during curing is substantially neutralized by the inorganic metal oxides or hydroxides. The metal oxides and hydroxides that are generally used are those of magnesium, calcium or lead. Magnesium oxide, calcium oxide, lead oxide and calcium hydroxide are preferred, especially magnesium oxide. The amount of acid acceptor varies depending on the particular polyhydroxy alcohol that is used in the composition and the chlorinated polyolefin to be cured. Generally, only about 0.025-0.25 moles of acid acceptor per 100 parts chlorosulfonated polyethylene is added to the composition and preferably about 0.05-0.15 moles of acid acceptor per 100 parts of chlorosulfonated polyethylene is added to the composition to obtain a satisfactory cure. When chlorinated polyethylene is cured, generally, the amount of acid acceptor used is about 0.01-0.1 moles per 100 parts of chlorinated polyethylene, preferably about 0.025- 0.075 moles per 100 parts chlorinated polyethylene. As a rule the higher the amount of polyhydroxy alcohol added to the composition, the lower the amount of acid acceptor which can be used. Low levels of acid acceptor result in better processing of the elastomer due to lower compound viscosity.
Optionally, in addition to the peroxide curing agent a conventional coagent can be present in the elastomer composition, generally in amounts up to 6 parts per 100 parts chlorinated polyolefine, usually about 1 to 4 parts per 100 parts chlorinated polyolefin elastomer is adequate. These coagents are polyunsaturated compounds that cooperate with the peroxide curing agent to more efficiently use the peroxide. Generally, the coagents are organic compounds containing at least one, preferably two or more, aliphatic unsaturated groups, preferably allyl. Representative coagents that can be used include triallyl cyanurate, diallyl maleate and diallyl terephthalate.
The chlorinated polyethylene or chlorosulfonated polyethylene composition can, and usually does, contain conventional fillers, such as carbon black, calcium carbonate, clay, silica, hydrated alumina and the like; pigments such as titanium dioxide; and stabilizers such as dialkylthiodipropionate and thiodiethylene bis[3,5-di-t-butyl-4-hydroxyhydrocinnamate], in varying amounts.
The invention is illustrated by the following examples in which the proportions are given in parts by weight unless otherwise indicated.
EXAMPLES 1-22 INCLUDING COMPARATIVE EXAMPLES
One hundred parts of curable chlorosulfonated polyethylene containing, by weight, 35% Cl, 1% S is compounded on a two-roll mill with the following ingredients charged to the mill: 40 parts SRF Black, 3.2 parts dicumyl peroxide, 4 parts triallylcyanurate and metal oxide or hydroxide acid acceptor and polyhydroxy alcohol as indicated in the table below. The temperature of the mix during compounding is held below about 60° C. and the ingredients are uniformly mixed in about 4 minutes. The compounded stock is removed from the mill, cured for 30 minutes at 160° C., and tested as indicated. The test data show that the peroxide-cured chlorosulfonated polyethylenes that are cured in the presence of an aliphatic polyhydroxy alcohol have excellent compression set and other satisfactory physical properties thus indicating a tight cure.
                                  TABLE I                                 
__________________________________________________________________________
PARTS PER 100 RUBBER                                                      
__________________________________________________________________________
              1    2   3    4    5*   6    7    8*   9    10              
__________________________________________________________________________
INGREDIENTS                                                               
Magnesium Oxide                                                           
              5.sup.a                                                     
                   5.sup.a                                                
                       2.5.sup.a                                          
                            2.5.sup.a                                     
                                 5.sup.a                                  
                                      5.sup.a                             
                                           5.sup.a                        
                                                10.sup.a                  
                                                     10.sup.a             
                                                          10.sup.a        
Magnesium Hydroxide                                                       
Calcium oxide                                                             
Calcium hydroxide                                                         
Lead oxide                                                                
Pentaerythritol                                                           
              3        2    3         1    2    --   1    2               
(PE-200)                                                                  
2,2-Dimethyl-1,3-  4.6                                                    
propanediol                                                               
Ethylene glycol                                                           
Glycerol                                                                  
Mooney Scorch.sup.1                                                       
Original                                                                  
Minimum       25   24  20   21.5 22   24   23   29   23   26              
10 Point      >30  30  >30  >30  >30  >30  >30  >30  >30  >30             
Rise                                                                      
Stress-Strain-Properties                                                  
(Cured 30 min/160° C.)                                             
M.sub.100 (MPa).sup.2                                                     
              13.4 3.1 2.2  3.4  1.7  2.2  6.9  2.8  6.9  16.9            
M.sub.200 (MPa).sup.2                                                     
              --   10.3                                                   
                       5.2  10.0 2.8  5.3  21.0 5.9  20.3 --              
T.sub.B (MPa).sup.2                                                       
              21.7 19.0                                                   
                       13.6 17.9 5.5  12.4 24.5 12.4 23.8 23.1            
E.sub.B (%)   140  290 535  335  800  565  230  640  230  135             
Compression Set.sup.3                                                     
% (22 hrs/70° C.)                                                  
              13.5 27.5                                                   
                       35.5 22   87.5 44.5 16   52.5 16.5 10              
% (22 hrs/121° C.)                                                 
              26   45  72.5 51   112  82.5 38.5 77.5 38.5 29              
__________________________________________________________________________
              11   12* 13  14  15* 16  17* 18  19  20  21  22             
__________________________________________________________________________
INGREDIENTS                                                               
Magnesium Oxide                                                           
              10.sup.a                 5   5   5                          
Magnesium Hydroxide                                                       
                   7.2.sup.b                                              
                       7.2.sup.b                                          
Calcium oxide              7.1.sup.c               7.1.sup.c              
Calcium hydroxide              9.2.sup.d                                  
                                   9.2.sup.d                              
Lead oxide                                             10.sup.e           
                                                           20.sup.e       
Pentaerythritol                                                           
              3        2   4       2                                      
(PE-200)                                                                  
2,2-Dimethyl-1,3-                                                         
propanediol                                                               
Ethylene glycol                                            6              
Glycerol                                   2   2   4   4                  
Mooney Scorch.sup.1                                                       
Original                                                                  
Minimum       26                                                          
10 Point                                                                  
Rise          >30                                                         
Stress-Strain-Properties                                                  
(Cured 30 min/160° C.)                                             
M.sub.100 (MPa).sup.2                                                     
              19.3 1.7 8.6 1.7 2.7 10.0                                   
                                       1.4 15.2                           
                                               15.2                       
                                                   13.8                   
                                                       12.7               
                                                           9.6            
M.sub.200 (MPa).sup.2                                                     
              --   2.4 --  6.5 4.8 --  2.0 --  --  23.5                   
                                                       --  --             
T.sub.B (MPa).sup.2                                                       
              25.9 6.2 23.4                                               
                           8.6 19.0                                       
                                   20.7                                   
                                       7.2 26.2                           
                                               24.8                       
                                                   24.2                   
                                                       25.5               
                                                           23.8           
E.sub.B (%)   135  850 230 780 410 150 800 140 140 145 170 190            
Compression Set.sup.3                                                     
% (22 hrs/70° C.)                                                  
              8    92  17  80  27  9   83  11  10  28  13  23             
% (22 hrs/121° C.)                                                 
              29                                                          
__________________________________________________________________________
 .sup.1 ASTM D1646                                                        
 .sup.2 ASTM D412                                                         
 .sup.3 ASTM D395                                                         
 .sup.a 2.5, 5 and 10 parts MgO are equivalent to 0.06, 0.12 and 0.25 mole
 MgO respectively.                                                        
 .sup.b Equivalent to 0.12 moles Mg(OH).sub.2                             
 .sup.c Equivalent to 0.13 moles CaO                                      
 .sup.d Equivalent to 0.12 moles Ca(OH).sub.2                             
 .sup.e 10 and 20 parts PbO are equivalent to 0.045 and 0.09 moles PbO,   
 respectively                                                             
 *Comparative Example
EXAMPLES 23-30 INCLUDING COMPARATIVE EXAMPLES
One hundred parts of a curable chlorinated polyethylene elastomer containing 35% Cl by weight is compounded on a two-roll mill with the following ingredients charged to the mill: 40 parts SRF Black, 2.4 parts dicumyl peroxide, 1 part triallylcyanurate and a metal oxide or hydroxide acid acceptor and a polyhydroxy alcohol as indicated in the table below. The temperature of the mix during compounding is held below about 60° C. and the ingredients are uniformly mixed in about 4 minutes. The compounded stock is removed from the mill, cured for 30 minutes at 160° C. and tested as indicated. The test data show that the peroxide cured chlorinated polyethylenes that are cured in the presence of an aliphatic polyhydroxy alcohol have excellent compression set and other satisfactory physical properties thus indicating that a high degree of cure was attained.
                                  TABLE II                                
__________________________________________________________________________
              23* 24  25* 26  27* 28  29* 30                              
__________________________________________________________________________
Magnesium hydroxide                                                       
              --  --  --  --  1.4.sup.a                                   
                                  1.4.sup.a                               
                                      0.7.sup.a                           
                                          0.7.sup.a                       
Calcium Oxide 1.4.sup.b                                                   
                  1.4.sup.b                                               
                      1.5.sup.b                                           
                          11.5.sup.b                                      
                              --  --  --  --                              
Pentaerythritol (PE-200)                                                  
                  2   --  --      1   --  2                               
Glycerol      --  --  --  1   --  --  --  --                              
Stress-Strain-Properties                                                  
(Cured 30 min/160° C.)                                             
M.sub.100 (MPa).sup.1                                                     
              4.1 7.6 4.5 5.2 4.3 5.9 3.4 5.2                             
M.sub.200 (MPa).sup.1                                                     
              7.2 19.0                                                    
                      8.6 12.7                                            
                              9.0 14.3                                    
                                      11.8                                
                                          17.6                            
T.sub.B (MPa).sup.1                                                       
              14.5                                                        
                  21.4                                                    
                      15.5                                                
                          19.3                                            
                              15.5                                        
                                  18.7                                    
                                      15.8                                
                                          22.8                            
E.sub.B (%)   440 235 405 295 265 265 300 245                             
Compression Set.sup.2                                                     
% (22 hrs/70° C.)                                                  
              41  19  50  26  36  21  19  13                              
__________________________________________________________________________
 .sup.1 ASTM D412                                                         
 .sup.2 ASTM D395                                                         
 .sup.a 0.7 and 1.4 parts Mg(OH).sub.2 are equivalent to 0.012 and 0.024  
 moles Mg(OH).sub.2, respectively.                                        
 .sup.b 1.4 and 1.5 parts CaO are equivalent to 0.025 and 0.027 moles CaO 
 respectively.                                                            
 *Comparative Examples
EXAMPLES 31-38 INCLUDING COMPARATIVE EXAMPLE
The procedure described above in examples 23-30 is repeated except that magnesium oxide is used as the acid acceptor, and ethylene glycol and glycerol are used in the amounts indicated as the polyhydroxy alcohols.
                                  TABLE III                               
__________________________________________________________________________
              31* 32  33  34  35  36  37  38                              
__________________________________________________________________________
Magnesium oxide                                                           
              1.sup.a                                                     
                  1.sup.a                                                 
                      1.sup.a                                             
                          1.sup.a                                         
                              1.sup.a                                     
                                  1.sup.a                                 
                                      1.sup.a                             
                                          1.sup.a                         
(Maglite D)                                                               
Pentaerythritol                                                           
              --  0.5 1   2   --  --  --  --                              
(PE-200)                                                                  
Glycerol      --  --  --  --  0.5 1   2   --                              
Ethylene glycol                                                           
              --  --  --  --  --  --  --  1                               
Stress-Strain-Properties                                                  
(Cured 30 min at 160° C.)                                          
Original                                                                  
M.sub.100 (MPa).sup.1                                                     
              4.5 5.9 6.3 7.4 5.6 6.3 7.1 6.5                             
M.sub.200 (MPa).sup.1                                                     
              9.6 14.1                                                    
                      15.5                                                
                          17.9                                            
                              13.8                                        
                                  16.0                                    
                                      17.9                                
                                          15.9                            
T.sub.B (MPa).sup.1                                                       
              16.5                                                        
                  17.9                                                    
                      19.3                                                
                          20.7                                            
                              19.3                                        
                                  20.3                                    
                                      20.3                                
                                          20.0                            
E.sub.B (%)   345 245 245 235 270 250 225 260                             
Compression Set.sup.2                                                     
% (22 hrs. at 70° C.)                                              
              34  26  22  20  23  24  19  22                              
__________________________________________________________________________
 .sup.1 ASTM D412                                                         
 .sup.2 ASTM D395                                                         
 .sup.a Equivalent to 0.025 moles MgO                                     
 *Comparative Example

Claims (8)

I claim:
1. A process for curing a chlorinated polyolefin elastomer selected from the group consisting of chlorinated polyethylene having 20-50% chlorine by weight and chlorosulfonated polyethylene having 20-50% chlorine by weight and 0.2-1.5% sulfur by weight, by compounding a mixture of said elastomer, a basic metal oxide or hydroxide acid acceptor, an organic peroxide curing agent, and about 0.2-10 parts per 100 parts elastomer of at least one aliphatic polyhydroxy alcohol with the proviso that when the elastomer is chlorinated polyethylene about 0.01-0.1 moles of acid acceptor per 100 parts chlorinated polyethylene is added to the mixture and when the elastomer is chlorosulfonated polyethylene about 0.025-0.25 moles of acid acceptor per 100 parts chlorosulfonated polyethylene is added to the mixture, and said polyhydroxy alcohol has at least two hydroxyl groups in which the hydroxyl groups are in the 1,2 or 1,3 positions relative to each other and said polyhydroxy alcohol has a molecular weight of less than about 300 and heating the mixture to a temperature above the decomposition temperature of the peroxide and below the decomposition temperature of the elastomer until the elastomer is cured.
2. A process of claim 1 where the chlorinated polyolefin elastomer is chlorosulfonated polyethylene.
3. A process of claim 1 where the chlorinated polyolefin elastomer is chlorinated polyethylene.
4. A process of claims 1, 2 or 3 where the polyhydroxy alcohol contains 2-6 carbon atoms.
5. A process of claims 1, 2 or 3 where the acid acceptor is an oxide or hydroxide of magnesium.
6. A process of claims 1, 2 or 3 where the polyhydroxy alcohol is ethylene glycol.
7. A process of claims 1, 2 or 3 where the polyhydroxy alcohol is glycerol.
8. A process of claims 1, 2 or 3 where the polyhydroxy alcohol is pentaerythritol.
US06/527,562 1982-03-01 1983-08-29 Process for curing a chlorinated polyolefin in the presence of aliphatic polyhydroxy alcohol Expired - Lifetime US4499244A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745147A (en) * 1986-10-24 1988-05-17 E. I. Du Pont De Nemours And Company Vulcanizable chlorinated polyethylene compositions
US20020091214A1 (en) * 2000-12-22 2002-07-11 Waanders Petrus Paulus Transportable and safely packaged organic peroxide formulations comprising reactive phlegmatisers
FR2866892A1 (en) * 2004-02-27 2005-09-02 Arkema Composition of an organic peroxide and alcohol, useful as cross-linking and anti-efflorescence agents for thermoplastic polymers and elastomers

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Publication number Priority date Publication date Assignee Title
US2822353A (en) * 1955-10-12 1958-02-04 Hercules Powder Co Ltd Vulcanizable rubber composition and process
US2994688A (en) * 1959-06-10 1961-08-01 Du Pont Process for curing sulfochlorinated hydrocarbon polymers
GB891842A (en) * 1959-12-21 1962-03-21 Montedison Spa Vulcanisation of isobutene copolymers with organic peroxides
US3169826A (en) * 1961-03-30 1965-02-16 Merck & Co Inc Method of preparing a hydrated magnesium carbonate
GB1033041A (en) * 1963-02-21 1966-06-15 Montedison Spa Vulcanisable compositions
US3483664A (en) * 1967-04-19 1969-12-16 Celotex Corp Roofing system
US3522225A (en) * 1969-03-05 1970-07-28 Montedison Spa Vulcanization of elastomeric olefinic copolymers with organic diperoxides
US3650874A (en) * 1968-03-15 1972-03-21 Pneumatiques Caoutchouc Mfg Adhering rubbers and polyolefines by other than peroxide curing agents
JPS494306A (en) * 1972-05-01 1974-01-16
US3960821A (en) * 1974-12-13 1976-06-01 Basf Wyandotte Corporation Chloronitrosylated, chlorosulfonated hydrocarbon polymers and a process for the preparation thereof
US4117189A (en) * 1977-09-16 1978-09-26 E. I. Du Pont De Nemours And Company Electrically curable, elastomeric sealing strip
US4141878A (en) * 1978-04-14 1979-02-27 Monsanto Company Thermoplastic compositions of CSM rubber and polyolefin resin
JPS5516028A (en) * 1978-07-21 1980-02-04 Showa Yuka Kk Crosslinking of chlorinated polyethylene molded product
US4248764A (en) * 1979-01-19 1981-02-03 E. I. Du Pont De Nemours And Company Colorable, peroxide curable chlorinated polymer

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822353A (en) * 1955-10-12 1958-02-04 Hercules Powder Co Ltd Vulcanizable rubber composition and process
US2994688A (en) * 1959-06-10 1961-08-01 Du Pont Process for curing sulfochlorinated hydrocarbon polymers
GB891842A (en) * 1959-12-21 1962-03-21 Montedison Spa Vulcanisation of isobutene copolymers with organic peroxides
US3169826A (en) * 1961-03-30 1965-02-16 Merck & Co Inc Method of preparing a hydrated magnesium carbonate
GB1033041A (en) * 1963-02-21 1966-06-15 Montedison Spa Vulcanisable compositions
US3483664A (en) * 1967-04-19 1969-12-16 Celotex Corp Roofing system
US3650874A (en) * 1968-03-15 1972-03-21 Pneumatiques Caoutchouc Mfg Adhering rubbers and polyolefines by other than peroxide curing agents
US3522225A (en) * 1969-03-05 1970-07-28 Montedison Spa Vulcanization of elastomeric olefinic copolymers with organic diperoxides
JPS494306A (en) * 1972-05-01 1974-01-16
US3960821A (en) * 1974-12-13 1976-06-01 Basf Wyandotte Corporation Chloronitrosylated, chlorosulfonated hydrocarbon polymers and a process for the preparation thereof
US4117189A (en) * 1977-09-16 1978-09-26 E. I. Du Pont De Nemours And Company Electrically curable, elastomeric sealing strip
US4141878A (en) * 1978-04-14 1979-02-27 Monsanto Company Thermoplastic compositions of CSM rubber and polyolefin resin
JPS5516028A (en) * 1978-07-21 1980-02-04 Showa Yuka Kk Crosslinking of chlorinated polyethylene molded product
US4248764A (en) * 1979-01-19 1981-02-03 E. I. Du Pont De Nemours And Company Colorable, peroxide curable chlorinated polymer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745147A (en) * 1986-10-24 1988-05-17 E. I. Du Pont De Nemours And Company Vulcanizable chlorinated polyethylene compositions
US20020091214A1 (en) * 2000-12-22 2002-07-11 Waanders Petrus Paulus Transportable and safely packaged organic peroxide formulations comprising reactive phlegmatisers
US6803436B2 (en) * 2000-12-22 2004-10-12 Akzo Nobel N.V. Transportable and safely packaged organic peroxide formulations comprising reactive phlegmatisers
FR2866892A1 (en) * 2004-02-27 2005-09-02 Arkema Composition of an organic peroxide and alcohol, useful as cross-linking and anti-efflorescence agents for thermoplastic polymers and elastomers
WO2005092966A1 (en) * 2004-02-27 2005-10-06 Arkema France Organic aromatic peroxide and alcohol composition for elastomer crosslinking

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